New Delhi, May 12 -- The generational transition from a mechanically driven STOVL aircraft to a fly-by-wire fifth generation platform required doctrinal innovation. In 1999, the VAAC (Variable Advanced Aircraft Control) programme explored alternative control laws for the future JSF STOVL variant using a modified two-seat Harrier. Two candidate control logics were evaluated: one reflecting traditional Harrier concepts, and another introducing a blended regime where throttle consistently controlled speed and stick input governed longitudinal and vertical control. Testing-including carrier landings aboard HMS Invincible-ultimately informed the control philosophy adopted for the F-35B. Today, STOVL operations in the F-35B rely heavily on automa...